Demonstrators carry red placards with the words 'One father, one mother, it's obvious" in Paris on Sunday, Jan. 13, 2013, as thousands of protesters mobilized against the French president's plan to legalize gay marriage. The placard at center reads: "Pro-marriage, not anti-gay." (AP Photo/Michel Euler)

Photo by: Michel Euler

Demonstrators carry red placards with the words 'One father, one mother, it's obvious" in Paris on Sunday, Jan. 13, 2013, as thousands of protesters mobilized against the French president's plan to legalize gay marriage. The placard at center reads: "Pro-marriage, not anti-gay." (AP Photo/Michel Euler)